SYNOPSIS
#include <libssh2.h>
int libssh2_knownhost_writefile(LIBSSH2_KNOWNHOSTS *hosts,
const char *filename, int type);
DESCRIPTION
Writes all the known hosts to the specified file using the specified file format.filename specifies what filename to create
type specifies what file type it is, and LIBSSH2_KNOWNHOST_FILE_OPENSSH is the only currently supported format.